Dehydropolymerisation of Methylamine Borane and an N-Substituted Primary Amine Borane Using a PNP Fe Catalyst |
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| Authors: | Dr Felix Anke Dr Susanne Boye Dr Anke Spannenberg Dr Albena Lederer Prof?Dr Detlef Heller PD?Dr Torsten Beweries |
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| Institution: | 1. Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, 18059 Rostock, Germany;2. Leibniz-Institut für Polymerforschung Dresden, Hohe Str. 6, 01069 Dresden, Germany |
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| Abstract: | Dehydropolymerisation of methylamine borane (H3B?NMeH2) using the well-known iron amido complex (PNP)Fe(H)(CO)] (PNP=N(CH2CH2PiPr2)2) ( 1 ) gives poly(aminoborane)s by a chain-growth mechanism. In toluene, rapid dehydrogenation of H3B?NMeH2 following first-order behaviour as a limiting case of a more general underlying Michaelis–Menten kinetics is observed, forming aminoborane H2B=NMeH, which selectively couples to give high-molecular-weight poly(aminoborane)s (H2BNMeH)n and only traces of borazine (HBNMe)3 by depolymerisation after full conversion. Based on a series of comparative experiments using structurally related Fe catalysts and dimethylamine borane (H3B?NMe2H) polymer formation is proposed to occur by nucleophilic chain growth as reported earlier computationally and experimentally. A silyl functionalised primary borane H3B?N(CH2SiMe3)H2 was studied in homo- and co-dehydropolymerisation reactions to give the first examples for Si containing poly(aminoborane)s. |
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| Keywords: | B?N polymers dehydrogenation iron polymerisation SEC analysis |
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